How to delete everythings which can never recover (Android) English/Mala...

if you given to your Android phone service or saling..? befor you must watch the video tutorial, you can helpfull this, becose some peuples recover your parsonel photos or files.! in this video I'm introdusing you how to prottect your phone can't be never recover, so please watch the full video tutorial and share to your friends